Having problems with your Dell OptiPlex GX520 PC Desktop ?

CPU fan runs at high speed and won't boot

\015 Dell OptiPlex CPU FAN is runing at high speed\015

Answers :

Check the power supply for problems.
\015\012My computer wouldn't run thru the post up, no beep codes, only the fan running on high. The power switch didn't shut the computer down, it needed to be turned off at the power supply, or unplugged.
\015\012I replaced the motherboard to no avail. Only after changing out the power supply did it work correctly.
\015\012My theory is that the power supply quit supplying power to the motherboard, but kept supplying 12 volts to the fan.
\015\012The good news is that power supplies are cheaper than motherboards and easier to replace.
Change the setting in the BIOS menu. reboot your computer.. when you see the dell logo.. press F1 (or F2 if F1 doesn't work) button until you see the BIOS screen. Check for fan options and change it
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